CN101435009A - Synthetic slag suitable for unpolluted deoxidization with voltage applied between metal and slag - Google Patents
Synthetic slag suitable for unpolluted deoxidization with voltage applied between metal and slag Download PDFInfo
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- CN101435009A CN101435009A CNA200810203980XA CN200810203980A CN101435009A CN 101435009 A CN101435009 A CN 101435009A CN A200810203980X A CNA200810203980X A CN A200810203980XA CN 200810203980 A CN200810203980 A CN 200810203980A CN 101435009 A CN101435009 A CN 101435009A
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Abstract
The invention relates to synthetic slag being applicable to extra electric field pollution-free deoxidation between slag and metal and belongs to the field of the metallurgy of iron and steel refinement technical skill. The synthetic slag is characterized in that the synthetic slag has the following compositions by weight percent: 40-55 percent of CaO, 40-55 percent of Al2O3, 1-10 percent of MgO, 0.01-1 percent of FeO, and 0-1 percent of MnO; and CaO/ Al2O3 is equal to 0.8-1.2. The synthetic slag is characterized by low melting point, rapid melting speed, good fluidity, few volatilization, high oxygen ionic conductivity and the like. In addition, no dust pollution happens in the using process, premelting slag component is closer to the existing refining slag component, and few reformations are carried out to the prior art so that the cost is low.
Description
Technical field
The present invention relates to a kind of synthetic slag that is applicable to the slag metal applied electric field pollution-free deoxygenation, belong to ferrous metallurgy refinery practice technical field.
Background technology
Along with the develop rapidly of science and technology, people are more and more higher to the requirement of the quality of steel.As everyone knows, the deoxidation products of smelting process is the primary pollution source in the molten steel, so steel liquid deoxidation is a very important problem in the steelmaking process.For a long time, steelmaker author gives the attention of height always to this problem.Yet traditional method of deoxidation can't satisfy people's requirement more and more higher to the metallic substance cleanliness factor, and the method for deoxidation of demanding seeking a kind of cleaning urgently removes the oxygen in the steel.Based on this, some metallargists have attempted some electrochemical deoxidising methods and have carried out the deoxidation of molten metal.Wherein main method concentrates on utilizes zirconia solid electrolyte, by electrolytic process, galvanic cell method and deoxidant body method etc. with oxonium ion directional guide in addition, make with solid electrolyte in reductor such as hydrogen, carbon monoxide or active metal reaction, the correlated response product as: water, carbonic acid gas or oxide compound and metal melt do not come in contact, thereby reach deoxidation and the purpose of pollution metal liquid not.These research thinkings are embodied in the Chinese invention patent application case of publication number CN1215759A, CN1187542A, CN1335413A, and in the Chinese utility application case of publication number CN2432220Y.Although utilize solid electrolyte for the method for deoxidation of transmission medium has advantages such as pollution-free, that deoxidation speed is fast, also exist equipment complexity, cost higher, be difficult for problem such as popularization at the scene.
Under such background, problem at existing technology existence, on the basis of solid electrolyte pollution-free deoxidizing, a kind of new pollution-free deoxidizing method has been proposed: applying direct current electric field deoxidation method between the slag gold, promptly replace solid electrolyte with slag, between the slag gold, apply electric field and strengthen deoxidation, by conduction orientation and the speed of control oxonium ion in the slag system, thus the pollution-free deoxidizing of realization molten metal.Its research thinking is embodied in some patent documentations, is the Chinese invention patent of CN1453371A, CN101235430A etc. as publication number.These these methods have that equipment is simple, cost is low, can work continuously, need not advantages such as reductive agent.
Rationally the selection of slag system is one of key of whole technique, is concerning the level that whether oxygen in the molten steel can be taken off expection.Consider following principle for the selection of slag system: 1. slag has the flowability of appropriateness; 2. slag has relative stability; 3. slag is the reductibility slag and guarantees certain basicity, and the oxygen position of slag should be low more good more, and the oxygen capacity in the slag should be high as much as possible, guarantees deoxidation effect; 4. slag has higher oxygen ions migrate ability and good electrical conductivity, to help the carrying out of electrochemical reaction; 5. applying electrical potential is big more, reacts rapid more, and the deoxidation degree of depth is high more, and in order to make extra electric field adjustable extent broad, it is high that positively charged ion electrolysis current potential is wanted; 6. the composition of slag is wanted uniformity, guarantees that chemical property is stable; 7. good electrode process character is arranged; 8. when being applicable between the ladle slag gold added electric field deoxidation, ladle liner being corroded want slight.
The outfield deoxy technology is a kind of new deoxidation thinking that is based upon on other method of deoxidation deficiencies between the slag gold, and purpose is in order to reduce the oxygen level in the cast steel, belong to the later stage refining of steel on technology.Its metallurgy action has some similarity with ladle refining furnace (LF) refining to a certain extent.Ladle refining furnace (LF) refining slag generally all has the diffusive deoxidation ability.The slag system of studying among the present invention develops from refining slag just.
Summary of the invention
The object of the present invention is to provide a kind of synthetic slag that is applicable to the slag metal applied electric field pollution-free deoxygenation.
For achieving the above object, the present invention adopts following technical scheme:
A kind of synthetic slag that is applicable to the slag metal applied electric field pollution-free deoxygenation is characterized in that the composition of this synthetic slag and mass percent are:
CaO 40-55％， Al
2O
3 40-55％，
MgO 1～10％， FeO 0.01～1％，
MnO 0～1％；
More than each constituent mass per-cent sum be 100%.
CaO and Al in the above-mentioned synthetic slag
2O
3Mass ratio 0.8～1.2.
Prepare the method for the above-mentioned synthetic slag that is applicable to the slag metal applied electric field pollution-free deoxygenation, can adopt fritting-hybrid technique, concrete steps are: according to the above ratio with CaO, Al
2O
3After mixing evenly with MgO, be positioned over and be heated to fusion in the electric induction furnace, get melt; The gained melt is chilled to room temperature, obtains frit; With this frit fragmentation, grind then, sieve, after the drying, according to the above ratio the frit powder after FeO and MnO powder and the pulverizing is mixed again; The encapsulation of dry back is standby; In use this mixture forms synthetic slag.
Characteristics of the present invention are as described below:
The composition of pre-melted slag of the present invention is all in the low melting point district, it is low to have fusing point, and burn-off rate is fast, good fluidity, the oxygen ionic conductivity height, volatilization is few, can electrolysis under the high temperature, and surface tension is little, viscosity is suitable, the characteristics of good stability, no dust pollution in the use has good energy-conservation and environment protecting.Pre-melted slag component and existing refining slag composition are more approaching in addition, and little to existing technological transformation, cost is low, can satisfy the requirement of scale operation.
Embodiment
After now specific embodiments of the invention being described in.
Embodiment 1
The chemical constitution and the weight percent thereof of the slag of setting in the present embodiment are as follows: CaO:48%, Al
2O
3: 44%, MgO:7.95%, FeO 0.02%, and MnO 0.03%; CaO/Al wherein
2O
3=1.09.
With the CaO of above-mentioned certainweight, MgO and Al
2O
3After powder mixes, be positioned in the electric induction furnace, be heated to 1600 ℃, make its fusing, this is the fritting process.Then with above-mentioned melt air cooling to room temperature, obtain frit; This frit is carried out fragmentation, grind, sieve, after the drying, a certain amount of FeO and MnO powder are mixed mutually with the fritting frit powder of gained, and make and mix; The encapsulation of dry back is standby.
The application test of synthetic slag is as described below:
The synthetic slag 0.135kg of present embodiment gained is invested in 20 of 0.42kg
#In the molten steel, and heat in molybdenum wire furnace, Heating temperature is 1550 ℃; Between synthetic slag and molten steel, apply the DC electric field of 1.2V, experience after 10 minutes, detect the oxygen level of finding in the molten steel and drop to 29ppm by 155ppm.
Embodiment 2
The chemical constitution and the weight percent thereof of the slag of setting in the present embodiment are as follows: CaO:47.08%, Al
2O
3: 47.96%, MgO:4.86%, FeO 0.10%; CaO/Al wherein
2O
3=0.98.
With the CaO of above-mentioned certainweight, MgO and Al
2O
3After powder mixes, be positioned in the electric induction furnace, be heated to 1600 ℃, make its fusing, this is the fritting process.Then with above-mentioned melt air cooling to room temperature, obtain frit; This frit is carried out fragmentation, grind, sieve, after the drying, a certain amount of FeO and MnO powder are mixed mutually with the fritting frit powder of gained, and make and mix; The encapsulation of dry back is standby.
The application test of synthetic slag is as described below:
The synthetic slag 0.10kg of present embodiment gained is invested in 20 of 0.445kg
#In the molten steel, and heat in molybdenum wire furnace, Heating temperature is 1550 ℃; Between synthetic slag and molten steel, apply the DC electric field of 2V, experience after 10 minutes, detect the oxygen level of finding in the molten steel and drop to 12ppm by 188ppm.
Claims (2)
1. synthetic slag that is applicable to the slag metal applied electric field pollution-free deoxygenation is characterized in that the composition of this synthetic slag and mass percent are:
CaO 40-55％，Al
2O
3 40-55％，
MgO 1～10％，FeO 0.01～1％，
MnO 0～1％；
More than each constituent mass per-cent sum be 100%.
2. the synthetic slag that is applicable to the slag metal applied electric field pollution-free deoxygenation according to claim 1 is characterized in that CaO and Al in the described synthetic slag
2O
3Mass ratio 0.8～1.2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200810203980XA CN101435009A (en) | 2008-12-04 | 2008-12-04 | Synthetic slag suitable for unpolluted deoxidization with voltage applied between metal and slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200810203980XA CN101435009A (en) | 2008-12-04 | 2008-12-04 | Synthetic slag suitable for unpolluted deoxidization with voltage applied between metal and slag |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101435009A true CN101435009A (en) | 2009-05-20 |
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ID=40709645
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|---|---|---|---|
| CNA200810203980XA Pending CN101435009A (en) | 2008-12-04 | 2008-12-04 | Synthetic slag suitable for unpolluted deoxidization with voltage applied between metal and slag |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102321784A (en) * | 2011-08-22 | 2012-01-18 | 辽宁天和科技股份有限公司 | Pre-molten conductive slag for electrochemical deoxidation and preparation method thereof |
| CN102399939A (en) * | 2010-09-07 | 2012-04-04 | 鞍钢股份有限公司 | Premelted slag for unpolluted deoxidization with externally applied voltage between metal and slag and preparation method thereof |
| CN102407321A (en) * | 2010-09-21 | 2012-04-11 | 鞍钢股份有限公司 | Electro slag remelting slag and manufacturing method thereof |
| CN102429312A (en) * | 2011-10-31 | 2012-05-02 | 华南理工大学 | Quick deoxidizer for in-situ generation of primary battery and preparation method thereof |
| CN102912081A (en) * | 2012-10-23 | 2013-02-06 | 鞍钢股份有限公司 | Method for processing molten steel and improving cleanliness of steel by aid of external electric field |
-
2008
- 2008-12-04 CN CNA200810203980XA patent/CN101435009A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102399939A (en) * | 2010-09-07 | 2012-04-04 | 鞍钢股份有限公司 | Premelted slag for unpolluted deoxidization with externally applied voltage between metal and slag and preparation method thereof |
| CN102399939B (en) * | 2010-09-07 | 2014-03-12 | 鞍钢股份有限公司 | Premelted slag for unpolluted deoxidization with externally applied voltage between metal and slag and preparation method thereof |
| CN102407321A (en) * | 2010-09-21 | 2012-04-11 | 鞍钢股份有限公司 | Electro slag remelting slag and manufacturing method thereof |
| CN102407321B (en) * | 2010-09-21 | 2014-06-04 | 鞍钢股份有限公司 | Electro slag remelting slag and manufacturing method thereof |
| CN102321784A (en) * | 2011-08-22 | 2012-01-18 | 辽宁天和科技股份有限公司 | Pre-molten conductive slag for electrochemical deoxidation and preparation method thereof |
| CN102429312A (en) * | 2011-10-31 | 2012-05-02 | 华南理工大学 | Quick deoxidizer for in-situ generation of primary battery and preparation method thereof |
| CN102912081A (en) * | 2012-10-23 | 2013-02-06 | 鞍钢股份有限公司 | Method for processing molten steel and improving cleanliness of steel by aid of external electric field |
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Open date: 20090520 |